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diff --git a/src/test/java/org/apache/commons/lang3/tuple/ImmutableTripleTest.java b/src/test/java/org/apache/commons/lang3/tuple/ImmutableTripleTest.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map.Entry;
+import java.util.TreeMap;
+
+import org.apache.commons.lang3.AbstractLangTest;
+import org.apache.commons.lang3.SerializationUtils;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test the Triple class.
+ */
+public class ImmutableTripleTest extends AbstractLangTest {
+
+    @Test
+    public void testBasic() {
+        final ImmutableTriple<Integer, String, Boolean> triple = new ImmutableTriple<>(0, "foo", Boolean.TRUE);
+        assertEquals(0, triple.left.intValue());
+        assertEquals(0, triple.getLeft().intValue());
+        assertEquals("foo", triple.middle);
+        assertEquals("foo", triple.getMiddle());
+        assertEquals(Boolean.TRUE, triple.right);
+        assertEquals(Boolean.TRUE, triple.getRight());
+        final ImmutableTriple<Object, String, Integer> triple2 = new ImmutableTriple<>(null, "bar", 42);
+        assertNull(triple2.left);
+        assertNull(triple2.getLeft());
+        assertEquals("bar", triple2.middle);
+        assertEquals("bar", triple2.getMiddle());
+        assertEquals(Integer.valueOf(42), triple2.right);
+        assertEquals(Integer.valueOf(42), triple2.getRight());
+    }
+
+    @Test
+    public void testEmptyArrayGenerics() {
+        final ImmutableTriple<Integer, String, Boolean>[] empty = ImmutableTriple.emptyArray();
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testEmptyArrayLength() {
+        @SuppressWarnings("unchecked")
+        final ImmutableTriple<Integer, String, Boolean>[] empty = (ImmutableTriple<Integer, String, Boolean>[]) ImmutableTriple.EMPTY_ARRAY;
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testEquals() {
+        assertEquals(ImmutableTriple.of(null, "foo", 42), ImmutableTriple.of(null, "foo", 42));
+        assertNotEquals(ImmutableTriple.of("foo", 0, Boolean.TRUE), ImmutableTriple.of("foo", null, null));
+        assertNotEquals(ImmutableTriple.of("foo", "bar", "baz"), ImmutableTriple.of("xyz", "bar", "blo"));
+
+        final ImmutableTriple<String, String, String> p = ImmutableTriple.of("foo", "bar", "baz");
+        assertEquals(p, p);
+        assertNotEquals(p, new Object());
+    }
+
+    @Test
+    public void testHashCode() {
+        assertEquals(ImmutableTriple.of(null, "foo", Boolean.TRUE).hashCode(), ImmutableTriple.of(null, "foo", Boolean.TRUE).hashCode());
+    }
+
+    @Test
+    public void testNullTripleEquals() {
+        assertEquals(ImmutableTriple.nullTriple(), ImmutableTriple.nullTriple());
+    }
+
+    @Test
+    public void testNullTripleLeft() {
+        assertNull(ImmutableTriple.nullTriple().getLeft());
+    }
+
+    @Test
+    public void testNullTripleMiddle() {
+        assertNull(ImmutableTriple.nullTriple().getMiddle());
+    }
+
+    @Test
+    public void testNullTripleRight() {
+        assertNull(ImmutableTriple.nullTriple().getRight());
+    }
+
+    @Test
+    public void testNullTripleSame() {
+        assertSame(ImmutableTriple.nullTriple(), ImmutableTriple.nullTriple());
+    }
+
+    @Test
+    public void testNullTripleTyped() {
+        // No compiler warnings
+        // How do we assert that?
+        final ImmutableTriple<String, String, String> triple = ImmutableTriple.nullTriple();
+        assertNotNull(triple);
+    }
+
+    @Test
+    public void testOfNonNull() {
+        assertThrows(NullPointerException.class, () -> ImmutableTriple.ofNonNull(null, null, null));
+        assertThrows(NullPointerException.class, () -> ImmutableTriple.ofNonNull(null, null, "z"));
+        assertThrows(NullPointerException.class, () -> ImmutableTriple.ofNonNull(null, "y", "z"));
+        assertThrows(NullPointerException.class, () -> ImmutableTriple.ofNonNull("x", null, null));
+        assertThrows(NullPointerException.class, () -> ImmutableTriple.ofNonNull("x", "y", null));
+        final ImmutableTriple<String, String, String> pair = ImmutableTriple.ofNonNull("x", "y", "z");
+        assertEquals("x", pair.left);
+        assertEquals("y", pair.middle);
+        assertEquals("z", pair.right);
+    }
+
+    @Test
+    public void testSerialization() throws Exception {
+        final ImmutableTriple<Integer, String, Boolean> origTriple = ImmutableTriple.of(0, "foo", Boolean.TRUE);
+        final ImmutableTriple<Integer, String, Boolean> deserializedTriple = SerializationUtils.roundtrip(origTriple);
+        assertEquals(origTriple, deserializedTriple);
+        assertEquals(origTriple.hashCode(), deserializedTriple.hashCode());
+    }
+
+    @Test
+    public void testToString() {
+        assertEquals("(null,null,null)", ImmutableTriple.of(null, null, null).toString());
+        assertEquals("(null,two,null)", ImmutableTriple.of(null, "two", null).toString());
+        assertEquals("(one,null,null)", ImmutableTriple.of("one", null, null).toString());
+        assertEquals("(one,two,null)", ImmutableTriple.of("one", "two", null).toString());
+        assertEquals("(null,two,three)", ImmutableTriple.of(null, "two", "three").toString());
+        assertEquals("(one,null,three)", ImmutableTriple.of("one", null, "three").toString());
+        assertEquals("(one,two,three)", MutableTriple.of("one", "two", "three").toString());
+    }
+
+    @Test
+    public void testTripleOf() {
+        final ImmutableTriple<Integer, String, Boolean> triple = ImmutableTriple.of(0, "foo", Boolean.FALSE);
+        assertEquals(0, triple.left.intValue());
+        assertEquals(0, triple.getLeft().intValue());
+        assertEquals("foo", triple.middle);
+        assertEquals("foo", triple.getMiddle());
+        assertEquals(Boolean.FALSE, triple.right);
+        assertEquals(Boolean.FALSE, triple.getRight());
+        final ImmutableTriple<Object, String, Boolean> triple2 = ImmutableTriple.of(null, "bar", Boolean.TRUE);
+        assertNull(triple2.left);
+        assertNull(triple2.getLeft());
+        assertEquals("bar", triple2.middle);
+        assertEquals("bar", triple2.getMiddle());
+        assertEquals(Boolean.TRUE, triple2.right);
+        assertEquals(Boolean.TRUE, triple2.getRight());
+    }
+
+    @Test
+    public void testUseAsKeyOfHashMap() {
+        final HashMap<ImmutableTriple<Object, Object, Object>, String> map = new HashMap<>();
+        final Object o1 = new Object();
+        final Object o2 = new Object();
+        final Object o3 = new Object();
+        final ImmutableTriple<Object, Object, Object> key1 = ImmutableTriple.of(o1, o2, o3);
+        final String value1 = "a1";
+        map.put(key1, value1);
+        assertEquals(value1, map.get(key1));
+        assertEquals(value1, map.get(ImmutableTriple.of(o1, o2, o3)));
+    }
+
+    @Test
+    public void testUseAsKeyOfTreeMap() {
+        final TreeMap<ImmutableTriple<Integer, Integer, Integer>, String> map = new TreeMap<>();
+        map.put(ImmutableTriple.of(0, 1, 2), "012");
+        map.put(ImmutableTriple.of(0, 1, 1), "011");
+        map.put(ImmutableTriple.of(0, 0, 1), "001");
+        final ArrayList<ImmutableTriple<Integer, Integer, Integer>> expected = new ArrayList<>();
+        expected.add(ImmutableTriple.of(0, 0, 1));
+        expected.add(ImmutableTriple.of(0, 1, 1));
+        expected.add(ImmutableTriple.of(0, 1, 2));
+        final Iterator<Entry<ImmutableTriple<Integer, Integer, Integer>, String>> it = map.entrySet().iterator();
+        for (final ImmutableTriple<Integer, Integer, Integer> item : expected) {
+            final Entry<ImmutableTriple<Integer, Integer, Integer>, String> entry = it.next();
+            assertEquals(item, entry.getKey());
+            assertEquals(item.getLeft() + "" + item.getMiddle() + "" + item.getRight(), entry.getValue());
+        }
+    }
+}
+